From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Directive from Mr. Royce regarding axle gear ratios for cars with different body weights.
| Identifier | ExFiles\Box 2\6\ B002_X 140 141 157-page192 | |
| Date | 5th March 1912 guessed | |
| AXLES (Ratio) Written by Mr Royce on March 5th. Handed to Technical Committee on March 8th. Mr Royce said - No car to be turned out with a higher gear ratio than 3 to 1. For heavy bodies the ratio should be about 3.3 to 1 and the above mentioned 3 to 1 used with the lightest bodies. With worm axles these ratios should be increased from 5% to 10% owing to the lower efficiency of this gearing. X 141 | ||